diff --git a/checksum.go b/checksum.go
index cd3f7a2..6948c9c 100644
--- a/checksum.go
+++ b/checksum.go
@@ -13,7 +13,15 @@ func md5str(s string) string {
 	return fmt.Sprintf("%x", h.Sum(nil))
 }
 
-func md5LeanworkForm(form url.Values) string {
+func MD5LeanworkFormP2P(form url.Values) string {
+	return md5LeanworkForm(form, Config.LeanWork.MD5P2P)
+}
+
+func MD5LeanworkFormFAT(form url.Values) string {
+	return md5LeanworkForm(form, Config.LeanWork.MD5FAT)
+}
+
+func md5LeanworkForm(form url.Values, key string) string {
 	s := ""
 	if _, ok := form["pickupUrl"]; ok {
 		s += form["pickupUrl"][0]
@@ -23,14 +31,14 @@ func md5LeanworkForm(form url.Values) string {
 		s += form["orderAmount"][0]
 		s += form["orderCurrency"][0]
 		s += form["customerId"][0]
-		s += Config.LeanWork.MD5Key
+		s += key
 	}
 	//fmt.Println("leanwork form: " + s)
 	return md5str(s)
 }
 
-func isLeanworkFormValid(form url.Values) bool {
-	r := md5LeanworkForm(form)
+func isLeanworkFormValid(form url.Values, md5key string) bool {
+	r := md5LeanworkForm(form, md5key)
 	sign := form["sign"][0]
 	return r == sign
 }